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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e04de659550e060f69065705410284681e18adec0de7bbc029016cd27345c36' 
  AND token = 'htZR8yKv0IQnxPv0sOJ8mLaWepfYWRWys9azH2+TxVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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