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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e19d76bc2f27912b1c05d56fb65c98e8f989f831e3be04048c7b9f9d9b986e3c' 
  AND token = 'ZjmyGBIxurCvCBdURfTUFIxP2+ie8lzaZHtBXp88B30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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