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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b408b8f4fad49da11ea1558d8a763407e7b63abdd37a3b76240c9ddd219cb15' 
  AND token = 'mwJiiEqMqMZFLxX1xHelcH/W4juQFQe5IN60gSCJj4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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