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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c24989ba6ee1873c72e0dbc07e07a1ae3b1d448279f0dbf12307f95f5ffd0a56' 
  AND token = 'ApoQC+jr+NYThLw7VjORdOF7sNZTc61CLkecutkb8fM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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