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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f997079c70033df7335cb802dc00c8f3edceeca6f04e702e134030eeda7849c1' 
  AND token = 'YKEnR9v/ubCKtIgCyXOKvZiazPdfKe0fU686wKowals=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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