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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '893030b6de6b9d38ae0e2e915d75d8d10630b9a455cf99616e6ffa6c3d49be15' 
  AND token = 'fydPoFSgKDjHll0RvozgY8sGSxZbjGAjwenSBVG6gV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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