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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37ff47952eea9f35edbd22b78853dfe8c3d056523928c995ad24cd776e7dcc07' 
  AND token = 'rlOrG7iFwC7HOw9Vj5UhJBws7kIE3OGq+MOLMkIEilw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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