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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd88a64efdde1d82cd6243abc2e1556bcde30e747bd1a92c43476d3d2b8b93672' 
  AND token = 'Tt41Ukh6ggiy1PO7hps0k5o6DCvCkAjvtoz4CkZ5wl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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