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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '726a07c39e609c308d316c7f74adc810f0f5e560e72e9054199cce6e9fa23f38' 
  AND token = 'ejqvvqErxqMHWtWBdBbmKoAngaQTsBLQw3FrR3mR5RU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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