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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70b1f5f28aedb609aa1177b4a8d9eccd9e69ac2a1c515f4db5fe019d833eb165' 
  AND token = 'w2LOchoXXBX2rAQHs5Jd9jR7WE7q3acmbA3ugxpivDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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