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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '766d58a7ff8436248342c912c3184ae13ce1c79d2689cf1f82669d98a54b3712' 
  AND token = 'dJt/PLdCXOTOb79OWknFP8zTO4Uc5hNzhbLPx8Lspd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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