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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa957ffa9c304dee2f0577b3951812d84bb3124d2eca98a0a18214676b63e6af' 
  AND token = 'iMqeiCgfurQihhcpfIHh1dtx5PtNGsdP364ICaIfTrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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