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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce1b2820b467c375ebd2b12bc1f36f446de0338014ac810e661d4d4384b6208b' 
  AND token = 'BAUQcCMcFA7wGYSrO9wfuc1IW68dSuGaF30ZxrJ4r2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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