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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ca8d21f23a08a833c1a2a95ba256ef2fa8eeb2b66d9b936401a8314ec736be3' 
  AND token = 'fumqBLXAyi4nq6O5lEvkocX5TAujmWzvcn4TnLik32E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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