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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c83ba84c54930b66ba1549f80dc69581195d7b160412621d0a055fc443443358' 
  AND token = 'IMIZTXRuhWnV4+Gd+0sNnp83FgxFsI+wKu+V9anT56s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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