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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f6c9fe99a6b1ae40c29da2c1831ddaee7f384f4852abf06a39bddb49d325dd3' 
  AND token = 'AfhsQZSGkgZhWN0voDhTIWYZ5mITU+Qd2IrPpAyeb2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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