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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fadd9f7e9cabe01e5ca7ef9a9004aee1fb521f1618557037eafa684e9b415e29' 
  AND token = '7IzqvClFqQkHGlNTtLItVOH1JG87lcUvSiEJlV4xcQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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