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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70f57cb4a38b35b04382913c2a2a6499bd73b815cd2fde9378847dac7598a33b' 
  AND token = '2ZU437p99sUtK4GHkdF3EMAPY5Uz9qWowmYeJE2fHYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00172

JSON explain

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