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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da18b606333e8261011eb085394c1a790c6f95c114099fc7bb7b3134e2308344' 
  AND token = '2QW89bcEFuEQSMgFPH4PDrTzfrewANPqY73ZJsLz6l4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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