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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7beda18bfdaf95ed7bde0040a9c4c007245f8eeda7f03337848ae8c28c7663b8' 
  AND token = 'CD8Qh85Jc2ri690m86r6PVi7216vOP19JqVwBCYFImQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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