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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b855420f3dc547673f29aeacfe8076db8ca6fe002f172a5a32d16beeb539eab' 
  AND token = 'oIhKivT1j+fkiuX0xamOwHyo2OPD4J5f81EfQeZoXAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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