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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '991af42db359e9386fa9ef6d91d8a4b59f5974064002f31d4aa97f95e0eacdac' 
  AND token = 'uV1nY3rIFssTcpDgdmECmvujcYEUbQTGt0svE6yPbgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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