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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4831a38d111ee38a9c2ae4dfe337e0828a3a473e6384a34b16e7e0f3cbfa1c8a' 
  AND token = '7LodOJL3SzOJlQSXIXZoLU8wZMlUCLtp6+nBcRyBxj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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