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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe1068a310ce64e783351605598836d2e3605a43b6e5e89df7f6533db155c159' 
  AND token = 'X3iD8YLnGZaSZTD9pus1ROc7024/j9vkSBE9x4scTsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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