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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78ce8e386e3ed29ae449bdadbaf53ae81d76594f4032338ed93efb87a74a6a10' 
  AND token = 'Kc7a69eu3niUTPdfXw3ymYTivKjar/nLodm3iNI5LxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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