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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b27c6992931b14f22c5f76415c3269e20c4c98148e8c1d5b7981e73ef40072b0' 
  AND token = 'G72q1qclWUCsFTpIhUlYfgVDDVl+UwYtN59psb9HIhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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