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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4872366712f545b22302c47e9dbddc13d09676ae61161ba56e4bc7c8b49e375' 
  AND token = 'ML9J5sNOddwzvSe09BNrUakrSSi6yO8JbuPrdJCY250=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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