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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc4121f6f6d094eed6221dab9b27ac6d1325ff591e904e1a5425d8d1bbf1a376' 
  AND token = 'Gy3+at5ijEjRTAn9uayaGz83S/A4P92/YC79QHtVwGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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