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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9334a1b47bab23b9b05a07e4fd7c985fea8ccf8c73c81ecdfb566c1e8748819' 
  AND token = 'NKq5G97sUkH1um8m0fk9Am4/Nb1cScj1fdFJpk4oagQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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