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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d71560c0b371a212a8a04568e471d8017373204d9a778b7e0aa839c228d966c' 
  AND token = '2fWz87/oq+7tRyD2Z/sJWd/tBUNwv9E0DQY9PsKkhjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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