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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37399bc8970214d9d8b6a434207945cdb010de87df7ce6b1e48cb4f953292159' 
  AND token = 'OUG/fU249Q/2Upz/yLn0MupkTsIS3U48mSjgu0eiTGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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