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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aa2af8d3470c80834ed32d3b3f83de7eff5a1c893986374704506182949b77c' 
  AND token = 'CppZTIoiXU+V3LmxLfgh1iX4ruXveF5hM/gaTdxsCek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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