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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aebd0c1df9150b469dbb79ee4e136eb4e605709c24cbe9f2fd98b5e2be560e5d' 
  AND token = '6DR9yCcwRiXtL8CqnLwHsBjSZhIWc78sDgAvoqqYUf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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