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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d33e802f93a1b9fedaebc8d250eb03e8f16b95cf4efc0234de2e4a28c16ee87' 
  AND token = 'Od+JyNRsDH10pUpJVsEaW4kDViwuqD2OMsHKTrtMV4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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