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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f76b343132b8b12268c4ad81b13ae5a7730620141dd677b3fe752cbe18cad948' 
  AND token = '30lKTwKT22l9f5mujKRpWoKiTaF08+TWIgAgwDHg6pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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