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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83a0fd72a62bb63a5ea1a12e362135e172e4841017e14c96a4b17201d38d549c' 
  AND token = 'xag+FDMVtU++xVDVx/LiI7BaHT/HYcW+qBts8mIwWrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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