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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87a3b2ed9e256c78ecb4a91738c45a9d9500631a8339f32f09b226c29329f520' 
  AND token = 'xInosISWAZsFNQxQ4RnlAMc2zlR7JkM59mH26dxpeQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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