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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5f271d752d49d7f3cdaa123ca6f3b44636e1bbd255d9e4fe3a2b105e0104fe1' 
  AND token = 'qRNeNC7j1vHsVVhTYwWsx2frOLRFozY/pwhAxtaNyYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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