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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f67717542a4b0c9c507bfaecb5ab88d1c6837f706ff95ffb8d5cbd18e1b2c73' 
  AND token = 'RSTDv6DUWDVsSsnWphaBwPvtERhBs2v8YG6xzNV+7y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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