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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dd82774a090f6b68226b12ca798343298a6dfa9b897665e3c43e4ea276f4c07' 
  AND token = 'XCMUK3H7DHWirIeyT7uMaBTRU3hVvRs6MkgRF6dNCN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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