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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '580fd1b4a845c54ccfb730538af26005b9006ac52020d063a8e7d9234af81cbc' 
  AND token = 'BheK8H5Ok8F7ObuLG/1wjQJ7ZChX9E7oqNUouTk0Ne0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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