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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1a35b4f3c70b58369a37d3e50d43462eb12695c2b4d3f268b7f03567853fc69' 
  AND token = 'FLMELbJtQ4o95Z5egJDBF8lsMQm9QWZx1q8a8Je3y6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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