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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebf2af5382763d62cbf7afa486dba2aac330b0c8a8be08a551d47e716a74e147' 
  AND token = 'OXyMmi0YKaX4p76q7PdzxaoQA4Vxdz6KR3w39saZnOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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