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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '520731a6aee21316ad39eec50ab2cd7430f7687c7a177f92a2e1eef0a9a36ec5' 
  AND token = 'i7AmOU6M7Fo4nhMvEIbueA2Ve5AsCb8hOA+olIoPsyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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