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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83bd6f1e228f55ab1b2799ccb488b0fbadcdb391002d3eed08e7744ddc30bbc9' 
  AND token = 'ObeXG7vY+sweUSsoB3hTNY7FwceymlaJqjTb3W8kQ58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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