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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fab6390caadaca3deeb04809baf47dcebfdd8626e46e149ef9114ed12c5714a' 
  AND token = 'fBju9ivpMHKduJ+dBvwmbTDE+2rZEC5lNHQtL63ltn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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