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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f334c023bf56ecdd1c8bf6d99e4f0e1f1d140c3f2a6ef84214910edc423815a1' 
  AND token = 'RFYU5b3+mt29xzhJ4o80bqjCm3dZbsMAmB+JmOnd/eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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