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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0534f9ba1526d00052e38523cecc937407ec4a826c5bd80c6bf58b70e03092a2' 
  AND token = 'WQvFHKGsOvX/kJkabSn8dYYwTw3fzE0w7Vo2jn0BAfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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