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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c513af4e35b004559ae809bb97a74f7392ee33893ee1004163e3aaf72127653a' 
  AND token = 'R6Kqk2LyMhYD/QiVuFOqPAXnPdX4OcX0NJypDf15+GY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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