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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47ba6e7c39ac9b15a3a40aecd156ccc97933feb20badf46c8ae5dad29590a960' 
  AND token = '8+jP7crUBJPLj4jaQyNwF+edR9xsVG0VhV6w+1YW5qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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