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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cec0604c6feb130e6d12413225e27752ad9bcb1469159de2b24ff8036f1e4d1c' 
  AND token = 'haEddAa2SXQk6C1tG8tv9HDLO8D5W2gGSpBzMft55gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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