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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5417992d02e7c12f602db2a8e7fe429a77f3502894874682be8a56a980ef05a7' 
  AND token = 'lOSTLVBV/UG7Wq9gjlwSeO/h2I0/f6spKVp3IEQKufI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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