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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11d64680b6cdec4ee991312e34a42636226c06fe91d2d1f9390dceec1bb2fd77' 
  AND token = 'Ihws5TXSF7oNfHXCSknm2N/gtHA5RbQfuiDHpRtw9kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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