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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50007b29be82260ac029be18ca668a9e28457ec896f76c7eaa9e4a42f09a4aac' 
  AND token = 'ELmJy9fNuhLrREI78ihoZ0nydob56LenXrNlAt5N4pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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