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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b19b0f79ea1e0e5ca057575b6217ad47b99705122a14150ffe413a1bf771abe' 
  AND token = 'HM1zHlLomeoKFYTvmELtVyeQ5uvMYejrFCvFd5QcZHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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