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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2669a2b9690a9aca64a91cdcb6f8ae81155e7e625c7030f333bbccc3455718dc' 
  AND token = 'aEFPTG7J7VGAZE4/zE146b/nVKGFpK+XYREkLyod1HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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