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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '656d967a2e4bfc19ff63f56312d55921c3fbc5d7301281c5ab70ca62cf1da8ce' 
  AND token = 'mUr+8kKrt7eUQ4ZMbVJ/4RpmJv6H9Ps0r7BodKa76nM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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