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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbdf3975de65268d80590419b5f1d93c160d0d0602f7635be4a8c32022b63e61' 
  AND token = '0zwtCD2Tv/SiM+ce68fvrZTv06py9v02heVtT10R+7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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