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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ca2135ff4082c07cf4a26a67ad10d58f733e33d3ac323a49a29c9b2fe4db579' 
  AND token = 'm/vj4nLcnIvPY4lS5o1ldKtfIDtigvMh5WNuoKQswvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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