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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ba55d26f50d4d8ad0bbb61db91745af284588eb3e40e9683182d0a28eacf268' 
  AND token = 'CHZRMCehuYU03zOZ9MRFv4JELNA428RriKrB98+x0OM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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