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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8824345c61fb7cfcd55d2e4577c105ced54626d79acb927c8f957e91bee875cf' 
  AND token = 'KFh//tuhKO5b20zLl4axnV/BN5ZMq0w9z+4Uo2rS39w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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