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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56271b09b9a20840675f4aadf331543cd74261ce97ab02a71fde1f2a6b72038f' 
  AND token = 'LN+GNuN3p+3kDeMxJkdbHxYActiA4++Nb9M3K45KF0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}