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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f74487bc6e7baa3dbe3b5a17b5c80ce122ba04cbfd74ff2ba98f4ffad191ff39' 
  AND token = '04qv9zZ2sfMNeGHjl5h3F+XkEQoIT9KE+iJUPDJG+Us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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