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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95bc3393f40200dc433427a0f88476a9ca57a29559afb38e8f01ec6a09d88de8' 
  AND token = 'TbwzzqGXXCNanduNn23mH/6gHMiiNjl8NuHoGSpPvXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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