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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dbb5ac300090d6bf79c537a128d1a59a10afcfede947dc96dd6e8611ed2a863' 
  AND token = '6duabqDkn/HKpjlSxmUTSJHMt4jS5rhFrna/6NwlGdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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