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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2596b50e5395ffd9c75905f431cc971c7551c6c8ff866c4d90500f4749e8116e' 
  AND token = 'Fmip8qE3SQpe6qQIGVyiSc2ANd424io+W/VQ42bOEa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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